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IEC60079-10-1 -Annex F -Hazardous Area Classification -HAC-Annex F.pptx
- 1. 1 Step by Stepprocedure for Classification of Hazardous Areas based upon :- • Grades of Release • Degree of dilution Availability of ventilation (Reference IEC60079-10-1 Annex F) ( Click only on the links marked with )
- 2. 2 Consider a flammable substancecontainer and the area surrounding it. Analysis (step-wise) Is the stored quantity of flammable substance enough and capable of producing a dangerous volume of explosive gas atmosphere ? NO YES
- 3. 3 The area isnon-hazardous return
- 4. 4 Are there anysources of release? NO YES Can sources of release be eliminated? YES NO
- 5. The grades ofeach release must be determined 5 SECONDARY grade of release PRIMARY grade of release CONTINUOUS grade of release Can it be changed to PRIMARY grade ? NO YES Can it be changed to Secondary grade ? NO Can this be eliminated NO YES YES
- 6. 6 Parameters which affectthe type and extent of zones must be evaluated .(for example : release rate, velocity) And the degree of dilution must be determined • MEDIUM • LOW Can it be changed to Medium Dilution? Can it be changed to High Dilution? YES YES NO NO • HIGH
- 7. 7 The availability ofthe ventilation must be determined GOOD FAIR POOR The type of zone is determined according to the degree of availability of VENTILATION Non-hazardous Area ZONE 2 Area ZONE 1 Area return
- 8. 8 The availability ofthe ventilation must be determined GOOD FAIR POOR The type of zone is determined according to the degree of availability of VENTILATION Zone 0 Zone 0 + Zone 2 Zone 0 + Zone 1 return
- 9. 9 The availability ofthe ventilation is not considered The type of zone is determined according to the degree of availability of VENTILATION Zone 0 return
- 10. 10 The area isnon-hazardous Return
- 11. 11 The area isnon-hazardous Return
- 12. 12 Parameters which affectthe type and extent of zones must be evaluated .(for example : release rate, velocity) And the degree of dilution must be determined (indoor locations require background concentration assessment) • MEDIUM • LOW Can it be changed to Medium Dilution? Can it be changed to High Dilution? YES YES NO NO • HIGH (YES)
- 13. 13 The availability ofthe ventilation is NOT considered GOOD FAIR POOR The type of zone is determined Non-hazardous (Zone 1 NE) ZONE 2 (Zone 1 NE) ZONE 2 (Zone 1 NE) Return
- 14. 14 The availability ofthe ventilation is NOT considered GOOD FAIR POOR The type of zone is determined Zone -1 Zone 1 + Zone 2 Zone 1 + Zone 2 Return
- 15. 15 The availability ofthe ventilation is NOT considered GOOD FAIR POOR The type of zone is determined Non-hazardous (Zone 1 NE) ZONE 2 (Zone 1 NE) ZONE 2 (Zone 1 NE) Return
- 16. The availability ofthe ventilation is not considered 16 GOOD FAIR POOR The type of zone is determined Zone 1 Zone 1 + Zone 2 Zone 1 + Zone 2 return
- 17. 17 The availability ofthe ventilation is not considered The type of zone is determined Zone 1 or zone 0 Return
- 18. 18 Parameters which affectthe type and extent of zones must be evaluated .(for example : release rate, velocity) And the degree of dilution must be determined • MEDIUM • LOW Can it be changed to Medium Dilution? Can it be changed to High Dilution? YES YES NO NO • HIGH
- 19. 19 The availability ofthe ventilation must be determined GOOD FAIR POOR The type of zone is determined Non-hazardous (Zone 2 NE) Non-hazardous ZONE 2 NE ZONE 2 return
- 20. 20 The availability ofthe ventilation must be determined GOOD FAIR POOR The type of zone is determined Zone 2 Zone 2 ZONE 2 return
- 21. 21 The availability ofthe ventilation is NOT considered The type of zone is determined ZONE 1 Or Zone 0 return
- 22.